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        Module&nbsp;util
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<h1 class="epydoc">Source Code for <a href="keyczar.util-module.html">Module keyczar.util</a></h1>
<pre class="py-src">
<a name="L1"></a><tt class="py-lineno">  1</tt>  <tt class="py-line"><tt class="py-comment">#!/usr/bin/python2.4</tt> </tt>
<a name="L2"></a><tt class="py-lineno">  2</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L3"></a><tt class="py-lineno">  3</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># Copyright 2008 Google Inc.</tt> </tt>
<a name="L4"></a><tt class="py-lineno">  4</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L5"></a><tt class="py-lineno">  5</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># Licensed under the Apache License, Version 2.0 (the "License");</tt> </tt>
<a name="L6"></a><tt class="py-lineno">  6</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># you may not use this file except in compliance with the License.</tt> </tt>
<a name="L7"></a><tt class="py-lineno">  7</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># You may obtain a copy of the License at</tt> </tt>
<a name="L8"></a><tt class="py-lineno">  8</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># </tt> </tt>
<a name="L9"></a><tt class="py-lineno">  9</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#      http://www.apache.org/licenses/LICENSE-2.0</tt> </tt>
<a name="L10"></a><tt class="py-lineno"> 10</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># </tt> </tt>
<a name="L11"></a><tt class="py-lineno"> 11</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># Unless required by applicable law or agreed to in writing, software</tt> </tt>
<a name="L12"></a><tt class="py-lineno"> 12</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># distributed under the License is distributed on an "AS IS" BASIS,</tt> </tt>
<a name="L13"></a><tt class="py-lineno"> 13</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</tt> </tt>
<a name="L14"></a><tt class="py-lineno"> 14</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># See the License for the specific language governing permissions and</tt> </tt>
<a name="L15"></a><tt class="py-lineno"> 15</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment"># limitations under the License.</tt> </tt>
<a name="L16"></a><tt class="py-lineno"> 16</tt>  <tt class="py-line"><tt class="py-comment"></tt> </tt>
<a name="L17"></a><tt class="py-lineno"> 17</tt>  <tt class="py-line"><tt class="py-docstring">"""</tt> </tt>
<a name="L18"></a><tt class="py-lineno"> 18</tt>  <tt class="py-line"><tt class="py-docstring">Utility functions for keyczar package.</tt> </tt>
<a name="L19"></a><tt class="py-lineno"> 19</tt>  <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L20"></a><tt class="py-lineno"> 20</tt>  <tt class="py-line"><tt class="py-docstring">@author: arkajit.dey@gmail.com (Arkajit Dey)</tt> </tt>
<a name="L21"></a><tt class="py-lineno"> 21</tt>  <tt class="py-line"><tt class="py-docstring">"""</tt> </tt>
<a name="L22"></a><tt class="py-lineno"> 22</tt>  <tt class="py-line"> </tt>
<a name="L23"></a><tt class="py-lineno"> 23</tt>  <tt class="py-line"><tt class="py-keyword">import</tt> <tt class="py-name">base64</tt> </tt>
<a name="L24"></a><tt class="py-lineno"> 24</tt>  <tt class="py-line"><tt class="py-keyword">import</tt> <tt class="py-name">math</tt> </tt>
<a name="L25"></a><tt class="py-lineno"> 25</tt>  <tt class="py-line"><tt class="py-keyword">import</tt> <tt class="py-name">sha</tt> </tt>
<a name="L26"></a><tt class="py-lineno"> 26</tt>  <tt class="py-line"> </tt>
<a name="L27"></a><tt class="py-lineno"> 27</tt>  <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">Crypto</tt><tt class="py-op">.</tt><tt class="py-name">Util</tt> <tt class="py-keyword">import</tt> <tt class="py-name">randpool</tt> </tt>
<a name="L28"></a><tt class="py-lineno"> 28</tt>  <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">pyasn1</tt><tt class="py-op">.</tt><tt class="py-name">codec</tt><tt class="py-op">.</tt><tt class="py-name">der</tt> <tt class="py-keyword">import</tt> <tt class="py-name">decoder</tt> </tt>
<a name="L29"></a><tt class="py-lineno"> 29</tt>  <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">pyasn1</tt><tt class="py-op">.</tt><tt class="py-name">codec</tt><tt class="py-op">.</tt><tt class="py-name">der</tt> <tt class="py-keyword">import</tt> <tt class="py-name">encoder</tt> </tt>
<a name="L30"></a><tt class="py-lineno"> 30</tt>  <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">pyasn1</tt><tt class="py-op">.</tt><tt class="py-name">type</tt> <tt class="py-keyword">import</tt> <tt class="py-name">univ</tt> </tt>
<a name="L31"></a><tt class="py-lineno"> 31</tt>  <tt class="py-line"> </tt>
<a name="L32"></a><tt class="py-lineno"> 32</tt>  <tt class="py-line"><tt class="py-keyword">import</tt> <tt id="link-0" class="py-name" targets="Module keyczar.errors=keyczar.errors-module.html"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-0', 'errors', 'link-0');">errors</a></tt> </tt>
<a name="L33"></a><tt class="py-lineno"> 33</tt>  <tt class="py-line"> </tt>
<a name="L34"></a><tt class="py-lineno"> 34</tt>  <tt class="py-line"><tt id="link-1" class="py-name" targets="Variable keyczar.util.HLEN=keyczar.util-module.html#HLEN"><a title="keyczar.util.HLEN" class="py-name" href="#" onclick="return doclink('link-1', 'HLEN', 'link-1');">HLEN</a></tt> <tt class="py-op">=</tt> <tt class="py-name">sha</tt><tt class="py-op">.</tt><tt class="py-name">digest_size</tt>  <tt class="py-comment"># length of the hash output</tt> </tt>
<a name="L35"></a><tt class="py-lineno"> 35</tt>  <tt class="py-line"> </tt>
<a name="L36"></a><tt class="py-lineno"> 36</tt>  <tt class="py-line"><tt class="py-comment">#RSAPrivateKey ::= SEQUENCE {</tt> </tt>
<a name="L37"></a><tt class="py-lineno"> 37</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  version Version,</tt> </tt>
<a name="L38"></a><tt class="py-lineno"> 38</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  modulus INTEGER, -- n</tt> </tt>
<a name="L39"></a><tt class="py-lineno"> 39</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  publicExponent INTEGER, -- e</tt> </tt>
<a name="L40"></a><tt class="py-lineno"> 40</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  privateExponent INTEGER, -- d</tt> </tt>
<a name="L41"></a><tt class="py-lineno"> 41</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  prime1 INTEGER, -- p</tt> </tt>
<a name="L42"></a><tt class="py-lineno"> 42</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  prime2 INTEGER, -- q</tt> </tt>
<a name="L43"></a><tt class="py-lineno"> 43</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  exponent1 INTEGER, -- d mod (p-1)</tt> </tt>
<a name="L44"></a><tt class="py-lineno"> 44</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  exponent2 INTEGER, -- d mod (q-1)</tt> </tt>
<a name="L45"></a><tt class="py-lineno"> 45</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  coefficient INTEGER -- (inverse of q) mod p }</tt> </tt>
<a name="L46"></a><tt class="py-lineno"> 46</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L47"></a><tt class="py-lineno"> 47</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#Version ::= INTEGER</tt> </tt>
<a name="L48"></a><tt class="py-lineno"> 48</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt id="link-2" class="py-name" targets="Variable keyczar.util.RSA_OID=keyczar.util-module.html#RSA_OID"><a title="keyczar.util.RSA_OID" class="py-name" href="#" onclick="return doclink('link-2', 'RSA_OID', 'link-2');">RSA_OID</a></tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">ObjectIdentifier</tt><tt class="py-op">(</tt><tt class="py-string">'1.2.840.113549.1.1.1'</tt><tt class="py-op">)</tt> </tt>
<a name="L49"></a><tt class="py-lineno"> 49</tt>  <tt class="py-line"><tt id="link-3" class="py-name" targets="Variable keyczar.util.RSA_PARAMS=keyczar.util-module.html#RSA_PARAMS"><a title="keyczar.util.RSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-3', 'RSA_PARAMS', 'link-3');">RSA_PARAMS</a></tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-string">'n'</tt><tt class="py-op">,</tt> <tt class="py-string">'e'</tt><tt class="py-op">,</tt> <tt class="py-string">'d'</tt><tt class="py-op">,</tt> <tt class="py-string">'p'</tt><tt class="py-op">,</tt> <tt class="py-string">'q'</tt><tt class="py-op">,</tt> <tt class="py-string">'dp'</tt><tt class="py-op">,</tt> <tt class="py-string">'dq'</tt><tt class="py-op">,</tt> <tt class="py-string">'invq'</tt><tt class="py-op">]</tt> </tt>
<a name="L50"></a><tt class="py-lineno"> 50</tt>  <tt class="py-line"><tt id="link-4" class="py-name" targets="Variable keyczar.util.DSA_OID=keyczar.util-module.html#DSA_OID"><a title="keyczar.util.DSA_OID" class="py-name" href="#" onclick="return doclink('link-4', 'DSA_OID', 'link-4');">DSA_OID</a></tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">ObjectIdentifier</tt><tt class="py-op">(</tt><tt class="py-string">'1.2.840.10040.4.1'</tt><tt class="py-op">)</tt> </tt>
<a name="L51"></a><tt class="py-lineno"> 51</tt>  <tt class="py-line"><tt id="link-5" class="py-name" targets="Variable keyczar.util.DSA_PARAMS=keyczar.util-module.html#DSA_PARAMS"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-5', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-string">'p'</tt><tt class="py-op">,</tt> <tt class="py-string">'q'</tt><tt class="py-op">,</tt> <tt class="py-string">'g'</tt><tt class="py-op">]</tt>  <tt class="py-comment"># only algorithm params, not public/private keys</tt> </tt>
<a name="L52"></a><tt class="py-lineno"> 52</tt>  <tt class="py-line"><tt id="link-6" class="py-name" targets="Variable keyczar.util.SHA1RSA_OID=keyczar.util-module.html#SHA1RSA_OID"><a title="keyczar.util.SHA1RSA_OID" class="py-name" href="#" onclick="return doclink('link-6', 'SHA1RSA_OID', 'link-6');">SHA1RSA_OID</a></tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">ObjectIdentifier</tt><tt class="py-op">(</tt><tt class="py-string">'1.2.840.113549.1.1.5'</tt><tt class="py-op">)</tt> </tt>
<a name="L53"></a><tt class="py-lineno"> 53</tt>  <tt class="py-line"><tt id="link-7" class="py-name" targets="Variable keyczar.util.SHA1_OID=keyczar.util-module.html#SHA1_OID"><a title="keyczar.util.SHA1_OID" class="py-name" href="#" onclick="return doclink('link-7', 'SHA1_OID', 'link-7');">SHA1_OID</a></tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">ObjectIdentifier</tt><tt class="py-op">(</tt><tt class="py-string">'1.3.14.3.2.26'</tt><tt class="py-op">)</tt> </tt>
<a name="L54"></a><tt class="py-lineno"> 54</tt>  <tt class="py-line"> </tt>
<a name="ASN1Sequence"></a><div id="ASN1Sequence-def"><a name="L55"></a><tt class="py-lineno"> 55</tt> <a class="py-toggle" href="#" id="ASN1Sequence-toggle" onclick="return toggle('ASN1Sequence');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ASN1Sequence">ASN1Sequence</a><tt class="py-op">(</tt><tt class="py-op">*</tt><tt class="py-param">vals</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ASN1Sequence-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ASN1Sequence-expanded"><a name="L56"></a><tt class="py-lineno"> 56</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Sequence</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L57"></a><tt class="py-lineno"> 57</tt>  <tt class="py-line">  <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">vals</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L58"></a><tt class="py-lineno"> 58</tt>  <tt class="py-line">    <tt class="py-name">seq</tt><tt class="py-op">.</tt><tt class="py-name">setComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">,</tt> <tt class="py-name">vals</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L59"></a><tt class="py-lineno"> 59</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">seq</tt> </tt>
</div><a name="L60"></a><tt class="py-lineno"> 60</tt>  <tt class="py-line"> </tt>
<a name="ParseASN1Sequence"></a><div id="ParseASN1Sequence-def"><a name="L61"></a><tt class="py-lineno"> 61</tt> <a class="py-toggle" href="#" id="ParseASN1Sequence-toggle" onclick="return toggle('ParseASN1Sequence');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ParseASN1Sequence">ParseASN1Sequence</a><tt class="py-op">(</tt><tt class="py-param">seq</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ParseASN1Sequence-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ParseASN1Sequence-expanded"><a name="L62"></a><tt class="py-lineno"> 62</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-op">[</tt><tt class="py-name">seq</tt><tt class="py-op">.</tt><tt class="py-name">getComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">]</tt> </tt>
</div><a name="L63"></a><tt class="py-lineno"> 63</tt>  <tt class="py-line"> </tt>
<a name="L64"></a><tt class="py-lineno"> 64</tt>  <tt class="py-line"><tt class="py-comment">#PrivateKeyInfo ::= SEQUENCE {</tt> </tt>
<a name="L65"></a><tt class="py-lineno"> 65</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  version Version,</tt> </tt>
<a name="L66"></a><tt class="py-lineno"> 66</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L67"></a><tt class="py-lineno"> 67</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,</tt> </tt>
<a name="L68"></a><tt class="py-lineno"> 68</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  privateKey PrivateKey,</tt> </tt>
<a name="L69"></a><tt class="py-lineno"> 69</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#  attributes [0] IMPLICIT Attributes OPTIONAL }</tt> </tt>
<a name="L70"></a><tt class="py-lineno"> 70</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L71"></a><tt class="py-lineno"> 71</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#Version ::= INTEGER</tt> </tt>
<a name="L72"></a><tt class="py-lineno"> 72</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L73"></a><tt class="py-lineno"> 73</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier</tt> </tt>
<a name="L74"></a><tt class="py-lineno"> 74</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L75"></a><tt class="py-lineno"> 75</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#PrivateKey ::= OCTET STRING</tt> </tt>
<a name="L76"></a><tt class="py-lineno"> 76</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#</tt> </tt>
<a name="L77"></a><tt class="py-lineno"> 77</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#Attributes ::= SET OF Attribute</tt> </tt>
<a name="ParsePkcs8"></a><div id="ParsePkcs8-def"><a name="L78"></a><tt class="py-lineno"> 78</tt> <a class="py-toggle" href="#" id="ParsePkcs8-toggle" onclick="return toggle('ParsePkcs8');">-</a><tt class="py-line"><tt class="py-comment"></tt><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ParsePkcs8">ParsePkcs8</a><tt class="py-op">(</tt><tt class="py-param">pkcs8</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ParsePkcs8-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ParsePkcs8-expanded"><a name="L79"></a><tt class="py-lineno"> 79</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-8" class="py-name" targets="Function keyczar.util.ParseASN1Sequence()=keyczar.util-module.html#ParseASN1Sequence"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-8', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">decoder</tt><tt class="py-op">.</tt><tt class="py-name">decode</tt><tt class="py-op">(</tt><tt id="link-9" class="py-name" targets="Function keyczar.util.Decode()=keyczar.util-module.html#Decode"><a title="keyczar.util.Decode" class="py-name" href="#" onclick="return doclink('link-9', 'Decode', 'link-9');">Decode</a></tt><tt class="py-op">(</tt><tt class="py-name">pkcs8</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L80"></a><tt class="py-lineno"> 80</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt> <tt class="py-op">!=</tt> <tt class="py-number">3</tt><tt class="py-op">:</tt>  <tt class="py-comment"># need three fields in PrivateKeyInfo</tt> </tt>
<a name="L81"></a><tt class="py-lineno"> 81</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-10" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-10', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-11" class="py-name" targets="Class keyczar.errors.KeyczarError=keyczar.errors.KeyczarError-class.html"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-11', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Illegal PKCS8 String."</tt><tt class="py-op">)</tt> </tt>
<a name="L82"></a><tt class="py-lineno"> 82</tt>  <tt class="py-line">  <tt class="py-name">version</tt> <tt class="py-op">=</tt> <tt class="py-name">int</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L83"></a><tt class="py-lineno"> 83</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">version</tt> <tt class="py-op">!=</tt> <tt class="py-number">0</tt><tt class="py-op">:</tt> </tt>
<a name="L84"></a><tt class="py-lineno"> 84</tt>  <tt class="py-line">      <tt class="py-keyword">raise</tt> <tt id="link-12" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-12', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-13" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-13', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Unrecognized PKCS8 Version"</tt><tt class="py-op">)</tt> </tt>
<a name="L85"></a><tt class="py-lineno"> 85</tt>  <tt class="py-line">  <tt class="py-op">[</tt><tt class="py-name">oid</tt><tt class="py-op">,</tt> <tt class="py-name">alg_params</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt id="link-14" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-14', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">[</tt><tt class="py-number">1</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L86"></a><tt class="py-lineno"> 86</tt>  <tt class="py-line">  <tt class="py-name">key</tt> <tt class="py-op">=</tt> <tt class="py-name">decoder</tt><tt class="py-op">.</tt><tt class="py-name">decode</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">[</tt><tt class="py-number">2</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt> </tt>
<a name="L87"></a><tt class="py-lineno"> 87</tt>  <tt class="py-line">  <tt class="py-comment"># Component 2 is an OCTET STRING which is further decoded</tt> </tt>
<a name="L88"></a><tt class="py-lineno"> 88</tt>  <tt class="py-line"><tt class="py-comment"></tt>  <tt class="py-name">params</tt> <tt class="py-op">=</tt> <tt class="py-op">{</tt><tt class="py-op">}</tt> </tt>
<a name="L89"></a><tt class="py-lineno"> 89</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">oid</tt> <tt class="py-op">==</tt> <tt id="link-15" class="py-name"><a title="keyczar.util.RSA_OID" class="py-name" href="#" onclick="return doclink('link-15', 'RSA_OID', 'link-2');">RSA_OID</a></tt><tt class="py-op">:</tt> </tt>
<a name="L90"></a><tt class="py-lineno"> 90</tt>  <tt class="py-line">    <tt class="py-name">key</tt> <tt class="py-op">=</tt> <tt id="link-16" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-16', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">key</tt><tt class="py-op">)</tt> </tt>
<a name="L91"></a><tt class="py-lineno"> 91</tt>  <tt class="py-line">    <tt class="py-name">version</tt> <tt class="py-op">=</tt> <tt class="py-name">int</tt><tt class="py-op">(</tt><tt class="py-name">key</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L92"></a><tt class="py-lineno"> 92</tt>  <tt class="py-line">    <tt class="py-keyword">if</tt> <tt class="py-name">version</tt> <tt class="py-op">!=</tt> <tt class="py-number">0</tt><tt class="py-op">:</tt> </tt>
<a name="L93"></a><tt class="py-lineno"> 93</tt>  <tt class="py-line">      <tt class="py-keyword">raise</tt> <tt id="link-17" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-17', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-18" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-18', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Unrecognized RSA Private Key Version"</tt><tt class="py-op">)</tt> </tt>
<a name="L94"></a><tt class="py-lineno"> 94</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt id="link-19" class="py-name"><a title="keyczar.util.RSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-19', 'RSA_PARAMS', 'link-3');">RSA_PARAMS</a></tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L95"></a><tt class="py-lineno"> 95</tt>  <tt class="py-line">      <tt class="py-name">params</tt><tt class="py-op">[</tt><tt id="link-20" class="py-name"><a title="keyczar.util.RSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-20', 'RSA_PARAMS', 'link-3');">RSA_PARAMS</a></tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">key</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">+</tt><tt class="py-number">1</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L96"></a><tt class="py-lineno"> 96</tt>  <tt class="py-line">  <tt class="py-keyword">elif</tt> <tt class="py-name">oid</tt> <tt class="py-op">==</tt> <tt id="link-21" class="py-name"><a title="keyczar.util.DSA_OID" class="py-name" href="#" onclick="return doclink('link-21', 'DSA_OID', 'link-4');">DSA_OID</a></tt><tt class="py-op">:</tt> </tt>
<a name="L97"></a><tt class="py-lineno"> 97</tt>  <tt class="py-line">    <tt class="py-name">alg_params</tt> <tt class="py-op">=</tt> <tt id="link-22" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-22', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">alg_params</tt><tt class="py-op">)</tt> </tt>
<a name="L98"></a><tt class="py-lineno"> 98</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt id="link-23" class="py-name"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-23', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L99"></a><tt class="py-lineno"> 99</tt>  <tt class="py-line">      <tt class="py-name">params</tt><tt class="py-op">[</tt><tt id="link-24" class="py-name"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-24', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">alg_params</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L100"></a><tt class="py-lineno">100</tt>  <tt class="py-line">    <tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'x'</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">key</tt><tt class="py-op">)</tt> </tt>
<a name="L101"></a><tt class="py-lineno">101</tt>  <tt class="py-line">  <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L102"></a><tt class="py-lineno">102</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-25" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-25', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-26" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-26', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Unrecognized AlgorithmIdentifier: not RSA/DSA"</tt><tt class="py-op">)</tt> </tt>
<a name="L103"></a><tt class="py-lineno">103</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">params</tt> </tt>
</div><a name="L104"></a><tt class="py-lineno">104</tt>  <tt class="py-line"> </tt>
<a name="ExportRsaPkcs8"></a><div id="ExportRsaPkcs8-def"><a name="L105"></a><tt class="py-lineno">105</tt> <a class="py-toggle" href="#" id="ExportRsaPkcs8-toggle" onclick="return toggle('ExportRsaPkcs8');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ExportRsaPkcs8">ExportRsaPkcs8</a><tt class="py-op">(</tt><tt class="py-param">params</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ExportRsaPkcs8-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ExportRsaPkcs8-expanded"><a name="L106"></a><tt class="py-lineno">106</tt>  <tt class="py-line">  <tt class="py-name">oid</tt> <tt class="py-op">=</tt> <tt id="link-27" class="py-name" targets="Function keyczar.util.ASN1Sequence()=keyczar.util-module.html#ASN1Sequence"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-27', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt id="link-28" class="py-name"><a title="keyczar.util.RSA_OID" class="py-name" href="#" onclick="return doclink('link-28', 'RSA_OID', 'link-2');">RSA_OID</a></tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Null</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L107"></a><tt class="py-lineno">107</tt>  <tt class="py-line">  <tt class="py-name">key</tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Sequence</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt class="py-name">setComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt><tt class="py-op">)</tt>  <tt class="py-comment"># version</tt> </tt>
<a name="L108"></a><tt class="py-lineno">108</tt>  <tt class="py-line">  <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt id="link-29" class="py-name"><a title="keyczar.util.RSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-29', 'RSA_PARAMS', 'link-3');">RSA_PARAMS</a></tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L109"></a><tt class="py-lineno">109</tt>  <tt class="py-line">    <tt class="py-name">key</tt><tt class="py-op">.</tt><tt class="py-name">setComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">+</tt><tt class="py-number">1</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt id="link-30" class="py-name"><a title="keyczar.util.RSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-30', 'RSA_PARAMS', 'link-3');">RSA_PARAMS</a></tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L110"></a><tt class="py-lineno">110</tt>  <tt class="py-line">  <tt class="py-name">octkey</tt> <tt class="py-op">=</tt> <tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">key</tt><tt class="py-op">)</tt> </tt>
<a name="L111"></a><tt class="py-lineno">111</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-31" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-31', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-name">oid</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">OctetString</tt><tt class="py-op">(</tt><tt class="py-name">octkey</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L112"></a><tt class="py-lineno">112</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt id="link-32" class="py-name" targets="Function keyczar.util.Encode()=keyczar.util-module.html#Encode"><a title="keyczar.util.Encode" class="py-name" href="#" onclick="return doclink('link-32', 'Encode', 'link-32');">Encode</a></tt><tt class="py-op">(</tt><tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
</div><a name="L113"></a><tt class="py-lineno">113</tt>  <tt class="py-line"> </tt>
<a name="ExportDsaPkcs8"></a><div id="ExportDsaPkcs8-def"><a name="L114"></a><tt class="py-lineno">114</tt> <a class="py-toggle" href="#" id="ExportDsaPkcs8-toggle" onclick="return toggle('ExportDsaPkcs8');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ExportDsaPkcs8">ExportDsaPkcs8</a><tt class="py-op">(</tt><tt class="py-param">params</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ExportDsaPkcs8-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ExportDsaPkcs8-expanded"><a name="L115"></a><tt class="py-lineno">115</tt>  <tt class="py-line">  <tt class="py-name">alg_params</tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Sequence</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L116"></a><tt class="py-lineno">116</tt>  <tt class="py-line">  <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt id="link-33" class="py-name"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-33', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L117"></a><tt class="py-lineno">117</tt>  <tt class="py-line">    <tt class="py-name">alg_params</tt><tt class="py-op">.</tt><tt class="py-name">setComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt id="link-34" class="py-name"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-34', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L118"></a><tt class="py-lineno">118</tt>  <tt class="py-line">  <tt class="py-name">oid</tt> <tt class="py-op">=</tt> <tt id="link-35" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-35', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt id="link-36" class="py-name"><a title="keyczar.util.DSA_OID" class="py-name" href="#" onclick="return doclink('link-36', 'DSA_OID', 'link-4');">DSA_OID</a></tt><tt class="py-op">,</tt> <tt class="py-name">alg_params</tt><tt class="py-op">)</tt> </tt>
<a name="L119"></a><tt class="py-lineno">119</tt>  <tt class="py-line">  <tt class="py-name">octkey</tt> <tt class="py-op">=</tt> <tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'x'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L120"></a><tt class="py-lineno">120</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-37" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-37', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-name">oid</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">OctetString</tt><tt class="py-op">(</tt><tt class="py-name">octkey</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L121"></a><tt class="py-lineno">121</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt id="link-38" class="py-name"><a title="keyczar.util.Encode" class="py-name" href="#" onclick="return doclink('link-38', 'Encode', 'link-32');">Encode</a></tt><tt class="py-op">(</tt><tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
</div><a name="L122"></a><tt class="py-lineno">122</tt>  <tt class="py-line"> </tt>
<a name="L123"></a><tt class="py-lineno">123</tt>  <tt class="py-line"><tt class="py-comment">#NOTE: not full X.509 certificate, just public key info</tt> </tt>
<a name="L124"></a><tt class="py-lineno">124</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#SubjectPublicKeyInfo  ::=  SEQUENCE  {</tt> </tt>
<a name="L125"></a><tt class="py-lineno">125</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#        algorithm            AlgorithmIdentifier,</tt> </tt>
<a name="L126"></a><tt class="py-lineno">126</tt>  <tt class="py-line"><tt class="py-comment"></tt><tt class="py-comment">#        subjectPublicKey     BIT STRING  }</tt> </tt>
<a name="ParseX509"></a><div id="ParseX509-def"><a name="L127"></a><tt class="py-lineno">127</tt> <a class="py-toggle" href="#" id="ParseX509-toggle" onclick="return toggle('ParseX509');">-</a><tt class="py-line"><tt class="py-comment"></tt><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ParseX509">ParseX509</a><tt class="py-op">(</tt><tt class="py-param">x509</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ParseX509-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ParseX509-expanded"><a name="L128"></a><tt class="py-lineno">128</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-39" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-39', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">decoder</tt><tt class="py-op">.</tt><tt class="py-name">decode</tt><tt class="py-op">(</tt><tt id="link-40" class="py-name"><a title="keyczar.util.Decode" class="py-name" href="#" onclick="return doclink('link-40', 'Decode', 'link-9');">Decode</a></tt><tt class="py-op">(</tt><tt class="py-name">x509</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L129"></a><tt class="py-lineno">129</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt> <tt class="py-op">!=</tt> <tt class="py-number">2</tt><tt class="py-op">:</tt>  <tt class="py-comment"># need two fields in SubjectPublicKeyInfo</tt> </tt>
<a name="L130"></a><tt class="py-lineno">130</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-41" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-41', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-42" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-42', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Illegal X.509 String."</tt><tt class="py-op">)</tt> </tt>
<a name="L131"></a><tt class="py-lineno">131</tt>  <tt class="py-line">  <tt class="py-op">[</tt><tt class="py-name">oid</tt><tt class="py-op">,</tt> <tt class="py-name">alg_params</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt id="link-43" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-43', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
<a name="L132"></a><tt class="py-lineno">132</tt>  <tt class="py-line">  <tt class="py-name">pubkey</tt> <tt class="py-op">=</tt> <tt class="py-name">decoder</tt><tt class="py-op">.</tt><tt class="py-name">decode</tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">OctetString</tt><tt class="py-op">(</tt><tt id="link-44" class="py-name" targets="Function keyczar.util.BinToBytes()=keyczar.util-module.html#BinToBytes"><a title="keyczar.util.BinToBytes" class="py-name" href="#" onclick="return doclink('link-44', 'BinToBytes', 'link-44');">BinToBytes</a></tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">[</tt><tt class="py-number">1</tt><tt class="py-op">]</tt><tt class="py-op">.</tt> </tt>
<a name="L133"></a><tt class="py-lineno">133</tt>  <tt class="py-line">                                                      <tt class="py-name">prettyPrint</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">1</tt><tt class="py-op">:</tt><tt class="py-op">-</tt><tt class="py-number">2</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt> </tt>
<a name="L134"></a><tt class="py-lineno">134</tt>  <tt class="py-line">  <tt class="py-comment"># Component 1 should be a BIT STRING, get raw bits by discarding extra chars,</tt> </tt>
<a name="L135"></a><tt class="py-lineno">135</tt>  <tt class="py-line"><tt class="py-comment"></tt>  <tt class="py-comment"># then convert to OCTET STRING which can be ASN.1 decoded</tt> </tt>
<a name="L136"></a><tt class="py-lineno">136</tt>  <tt class="py-line"><tt class="py-comment"></tt>  <tt class="py-name">params</tt> <tt class="py-op">=</tt> <tt class="py-op">{</tt><tt class="py-op">}</tt> </tt>
<a name="L137"></a><tt class="py-lineno">137</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">oid</tt> <tt class="py-op">==</tt> <tt id="link-45" class="py-name"><a title="keyczar.util.RSA_OID" class="py-name" href="#" onclick="return doclink('link-45', 'RSA_OID', 'link-2');">RSA_OID</a></tt><tt class="py-op">:</tt> </tt>
<a name="L138"></a><tt class="py-lineno">138</tt>  <tt class="py-line">    <tt class="py-op">[</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'n'</tt><tt class="py-op">]</tt><tt class="py-op">,</tt> <tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'e'</tt><tt class="py-op">]</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">x</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">x</tt> <tt class="py-keyword">in</tt> <tt id="link-46" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-46', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">pubkey</tt><tt class="py-op">)</tt><tt class="py-op">]</tt> </tt>
<a name="L139"></a><tt class="py-lineno">139</tt>  <tt class="py-line">  <tt class="py-keyword">elif</tt> <tt class="py-name">oid</tt> <tt class="py-op">==</tt> <tt id="link-47" class="py-name"><a title="keyczar.util.DSA_OID" class="py-name" href="#" onclick="return doclink('link-47', 'DSA_OID', 'link-4');">DSA_OID</a></tt><tt class="py-op">:</tt> </tt>
<a name="L140"></a><tt class="py-lineno">140</tt>  <tt class="py-line">    <tt class="py-name">vals</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">x</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">x</tt> <tt class="py-keyword">in</tt> <tt id="link-48" class="py-name"><a title="keyczar.util.ParseASN1Sequence" class="py-name" href="#" onclick="return doclink('link-48', 'ParseASN1Sequence', 'link-8');">ParseASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">alg_params</tt><tt class="py-op">)</tt><tt class="py-op">]</tt> </tt>
<a name="L141"></a><tt class="py-lineno">141</tt>  <tt class="py-line">    <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt id="link-49" class="py-name"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-49', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L142"></a><tt class="py-lineno">142</tt>  <tt class="py-line">      <tt class="py-name">params</tt><tt class="py-op">[</tt><tt id="link-50" class="py-name"><a title="keyczar.util.DSA_PARAMS" class="py-name" href="#" onclick="return doclink('link-50', 'DSA_PARAMS', 'link-5');">DSA_PARAMS</a></tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">vals</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt> </tt>
<a name="L143"></a><tt class="py-lineno">143</tt>  <tt class="py-line">    <tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'y'</tt><tt class="py-op">]</tt> <tt class="py-op">=</tt> <tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">pubkey</tt><tt class="py-op">)</tt> </tt>
<a name="L144"></a><tt class="py-lineno">144</tt>  <tt class="py-line">  <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L145"></a><tt class="py-lineno">145</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-51" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-51', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-52" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-52', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Unrecognized AlgorithmIdentifier: not RSA/DSA"</tt><tt class="py-op">)</tt> </tt>
<a name="L146"></a><tt class="py-lineno">146</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">params</tt> </tt>
</div><a name="L147"></a><tt class="py-lineno">147</tt>  <tt class="py-line"> </tt>
<a name="ExportRsaX509"></a><div id="ExportRsaX509-def"><a name="L148"></a><tt class="py-lineno">148</tt> <a class="py-toggle" href="#" id="ExportRsaX509-toggle" onclick="return toggle('ExportRsaX509');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ExportRsaX509">ExportRsaX509</a><tt class="py-op">(</tt><tt class="py-param">params</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ExportRsaX509-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ExportRsaX509-expanded"><a name="L149"></a><tt class="py-lineno">149</tt>  <tt class="py-line">  <tt class="py-name">oid</tt> <tt class="py-op">=</tt> <tt id="link-53" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-53', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt id="link-54" class="py-name"><a title="keyczar.util.RSA_OID" class="py-name" href="#" onclick="return doclink('link-54', 'RSA_OID', 'link-2');">RSA_OID</a></tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Null</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L150"></a><tt class="py-lineno">150</tt>  <tt class="py-line">  <tt class="py-name">key</tt> <tt class="py-op">=</tt> <tt id="link-55" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-55', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'n'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'e'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L151"></a><tt class="py-lineno">151</tt>  <tt class="py-line">  <tt class="py-name">binkey</tt> <tt class="py-op">=</tt> <tt id="link-56" class="py-name" targets="Function keyczar.util.BytesToBin()=keyczar.util-module.html#BytesToBin"><a title="keyczar.util.BytesToBin" class="py-name" href="#" onclick="return doclink('link-56', 'BytesToBin', 'link-56');">BytesToBin</a></tt><tt class="py-op">(</tt><tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">key</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L152"></a><tt class="py-lineno">152</tt>  <tt class="py-line">  <tt class="py-name">pubkey</tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">BitString</tt><tt class="py-op">(</tt><tt class="py-string">"'%s'B"</tt> <tt class="py-op">%</tt> <tt class="py-name">binkey</tt><tt class="py-op">)</tt>  <tt class="py-comment"># needs to be a BIT STRING</tt> </tt>
<a name="L153"></a><tt class="py-lineno">153</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-57" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-57', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">oid</tt><tt class="py-op">,</tt> <tt class="py-name">pubkey</tt><tt class="py-op">)</tt> </tt>
<a name="L154"></a><tt class="py-lineno">154</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt id="link-58" class="py-name"><a title="keyczar.util.Encode" class="py-name" href="#" onclick="return doclink('link-58', 'Encode', 'link-32');">Encode</a></tt><tt class="py-op">(</tt><tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
</div><a name="L155"></a><tt class="py-lineno">155</tt>  <tt class="py-line"> </tt>
<a name="ExportDsaX509"></a><div id="ExportDsaX509-def"><a name="L156"></a><tt class="py-lineno">156</tt> <a class="py-toggle" href="#" id="ExportDsaX509-toggle" onclick="return toggle('ExportDsaX509');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ExportDsaX509">ExportDsaX509</a><tt class="py-op">(</tt><tt class="py-param">params</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ExportDsaX509-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ExportDsaX509-expanded"><a name="L157"></a><tt class="py-lineno">157</tt>  <tt class="py-line">  <tt class="py-name">alg_params</tt> <tt class="py-op">=</tt> <tt id="link-59" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-59', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'p'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">,</tt>  </tt>
<a name="L158"></a><tt class="py-lineno">158</tt>  <tt class="py-line">                            <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'q'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">,</tt>  </tt>
<a name="L159"></a><tt class="py-lineno">159</tt>  <tt class="py-line">                            <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'g'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L160"></a><tt class="py-lineno">160</tt>  <tt class="py-line">  <tt class="py-name">oid</tt> <tt class="py-op">=</tt> <tt id="link-60" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-60', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt id="link-61" class="py-name"><a title="keyczar.util.DSA_OID" class="py-name" href="#" onclick="return doclink('link-61', 'DSA_OID', 'link-4');">DSA_OID</a></tt><tt class="py-op">,</tt> <tt class="py-name">alg_params</tt><tt class="py-op">)</tt> </tt>
<a name="L161"></a><tt class="py-lineno">161</tt>  <tt class="py-line">  <tt class="py-name">binkey</tt> <tt class="py-op">=</tt> <tt id="link-62" class="py-name"><a title="keyczar.util.BytesToBin" class="py-name" href="#" onclick="return doclink('link-62', 'BytesToBin', 'link-56');">BytesToBin</a></tt><tt class="py-op">(</tt><tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">params</tt><tt class="py-op">[</tt><tt class="py-string">'y'</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L162"></a><tt class="py-lineno">162</tt>  <tt class="py-line">  <tt class="py-name">pubkey</tt> <tt class="py-op">=</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">BitString</tt><tt class="py-op">(</tt><tt class="py-string">"'%s'B"</tt> <tt class="py-op">%</tt> <tt class="py-name">binkey</tt><tt class="py-op">)</tt>  <tt class="py-comment"># needs to be a BIT STRING</tt> </tt>
<a name="L163"></a><tt class="py-lineno">163</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-63" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-63', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">oid</tt><tt class="py-op">,</tt> <tt class="py-name">pubkey</tt><tt class="py-op">)</tt> </tt>
<a name="L164"></a><tt class="py-lineno">164</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt id="link-64" class="py-name"><a title="keyczar.util.Encode" class="py-name" href="#" onclick="return doclink('link-64', 'Encode', 'link-32');">Encode</a></tt><tt class="py-op">(</tt><tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
</div><a name="L165"></a><tt class="py-lineno">165</tt>  <tt class="py-line"> </tt>
<a name="MakeDsaSig"></a><div id="MakeDsaSig-def"><a name="L166"></a><tt class="py-lineno">166</tt> <a class="py-toggle" href="#" id="MakeDsaSig-toggle" onclick="return toggle('MakeDsaSig');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#MakeDsaSig">MakeDsaSig</a><tt class="py-op">(</tt><tt class="py-param">r</tt><tt class="py-op">,</tt> <tt class="py-param">s</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="MakeDsaSig-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="MakeDsaSig-expanded"><a name="L167"></a><tt class="py-lineno">167</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L168"></a><tt class="py-lineno">168</tt>  <tt class="py-line"><tt class="py-docstring">  Given the raw parameters of a DSA signature, return a Base64 signature.</tt> </tt>
<a name="L169"></a><tt class="py-lineno">169</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L170"></a><tt class="py-lineno">170</tt>  <tt class="py-line"><tt class="py-docstring">  @param r: parameter r of DSA signature</tt> </tt>
<a name="L171"></a><tt class="py-lineno">171</tt>  <tt class="py-line"><tt class="py-docstring">  @type r: long int</tt> </tt>
<a name="L172"></a><tt class="py-lineno">172</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L173"></a><tt class="py-lineno">173</tt>  <tt class="py-line"><tt class="py-docstring">  @param s: parameter s of DSA signature</tt> </tt>
<a name="L174"></a><tt class="py-lineno">174</tt>  <tt class="py-line"><tt class="py-docstring">  @type s: long int</tt> </tt>
<a name="L175"></a><tt class="py-lineno">175</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L176"></a><tt class="py-lineno">176</tt>  <tt class="py-line"><tt class="py-docstring">  @return: raw byte string formatted as an ASN.1 sequence of r and s</tt> </tt>
<a name="L177"></a><tt class="py-lineno">177</tt>  <tt class="py-line"><tt class="py-docstring">  @rtype: string   </tt> </tt>
<a name="L178"></a><tt class="py-lineno">178</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L179"></a><tt class="py-lineno">179</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt id="link-65" class="py-name"><a title="keyczar.util.ASN1Sequence" class="py-name" href="#" onclick="return doclink('link-65', 'ASN1Sequence', 'link-27');">ASN1Sequence</a></tt><tt class="py-op">(</tt><tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">r</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-name">univ</tt><tt class="py-op">.</tt><tt class="py-name">Integer</tt><tt class="py-op">(</tt><tt class="py-name">s</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L180"></a><tt class="py-lineno">180</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">encoder</tt><tt class="py-op">.</tt><tt class="py-name">encode</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt> </tt>
</div><a name="L181"></a><tt class="py-lineno">181</tt>  <tt class="py-line"> </tt>
<a name="ParseDsaSig"></a><div id="ParseDsaSig-def"><a name="L182"></a><tt class="py-lineno">182</tt> <a class="py-toggle" href="#" id="ParseDsaSig-toggle" onclick="return toggle('ParseDsaSig');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ParseDsaSig">ParseDsaSig</a><tt class="py-op">(</tt><tt class="py-param">sig</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ParseDsaSig-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ParseDsaSig-expanded"><a name="L183"></a><tt class="py-lineno">183</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L184"></a><tt class="py-lineno">184</tt>  <tt class="py-line"><tt class="py-docstring">  Given a raw byte string, return tuple of DSA signature parameters.</tt> </tt>
<a name="L185"></a><tt class="py-lineno">185</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L186"></a><tt class="py-lineno">186</tt>  <tt class="py-line"><tt class="py-docstring">  @param sig: byte string of ASN.1 representation</tt> </tt>
<a name="L187"></a><tt class="py-lineno">187</tt>  <tt class="py-line"><tt class="py-docstring">  @type sig: string</tt> </tt>
<a name="L188"></a><tt class="py-lineno">188</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L189"></a><tt class="py-lineno">189</tt>  <tt class="py-line"><tt class="py-docstring">  @return: parameters r, s as a tuple</tt> </tt>
<a name="L190"></a><tt class="py-lineno">190</tt>  <tt class="py-line"><tt class="py-docstring">  @rtype: tuple</tt> </tt>
<a name="L191"></a><tt class="py-lineno">191</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L192"></a><tt class="py-lineno">192</tt>  <tt class="py-line"><tt class="py-docstring">  @raise KeyczarErrror: if the DSA signature format is invalid </tt> </tt>
<a name="L193"></a><tt class="py-lineno">193</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L194"></a><tt class="py-lineno">194</tt>  <tt class="py-line">  <tt class="py-name">seq</tt> <tt class="py-op">=</tt> <tt class="py-name">decoder</tt><tt class="py-op">.</tt><tt class="py-name">decode</tt><tt class="py-op">(</tt><tt class="py-name">sig</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-number">0</tt><tt class="py-op">]</tt> </tt>
<a name="L195"></a><tt class="py-lineno">195</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">)</tt> <tt class="py-op">!=</tt> <tt class="py-number">2</tt><tt class="py-op">:</tt> </tt>
<a name="L196"></a><tt class="py-lineno">196</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-66" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-66', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-67" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-67', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Illegal DSA signature."</tt><tt class="py-op">)</tt> </tt>
<a name="L197"></a><tt class="py-lineno">197</tt>  <tt class="py-line">  <tt class="py-name">r</tt> <tt class="py-op">=</tt> <tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">.</tt><tt class="py-name">getComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L198"></a><tt class="py-lineno">198</tt>  <tt class="py-line">  <tt class="py-name">s</tt> <tt class="py-op">=</tt> <tt class="py-name">long</tt><tt class="py-op">(</tt><tt class="py-name">seq</tt><tt class="py-op">.</tt><tt class="py-name">getComponentByPosition</tt><tt class="py-op">(</tt><tt class="py-number">1</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L199"></a><tt class="py-lineno">199</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-op">(</tt><tt class="py-name">r</tt><tt class="py-op">,</tt> <tt class="py-name">s</tt><tt class="py-op">)</tt> </tt>
</div><a name="L200"></a><tt class="py-lineno">200</tt>  <tt class="py-line"> </tt>
<a name="MakeEmsaMessage"></a><div id="MakeEmsaMessage-def"><a name="L201"></a><tt class="py-lineno">201</tt> <a class="py-toggle" href="#" id="MakeEmsaMessage-toggle" onclick="return toggle('MakeEmsaMessage');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#MakeEmsaMessage">MakeEmsaMessage</a><tt class="py-op">(</tt><tt class="py-param">msg</tt><tt class="py-op">,</tt> <tt class="py-param">modulus_size</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="MakeEmsaMessage-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="MakeEmsaMessage-expanded"><a name="L202"></a><tt class="py-lineno">202</tt>  <tt class="py-line">  <tt class="py-docstring">"""Algorithm EMSA_PKCS1-v1_5 from PKCS 1 version 2"""</tt> </tt>
<a name="L203"></a><tt class="py-lineno">203</tt>  <tt class="py-line">  <tt class="py-name">magic_sha1_header</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-number">0x30</tt><tt class="py-op">,</tt> <tt class="py-number">0x21</tt><tt class="py-op">,</tt> <tt class="py-number">0x30</tt><tt class="py-op">,</tt> <tt class="py-number">0x9</tt><tt class="py-op">,</tt> <tt class="py-number">0x6</tt><tt class="py-op">,</tt> <tt class="py-number">0x5</tt><tt class="py-op">,</tt> <tt class="py-number">0x2b</tt><tt class="py-op">,</tt> <tt class="py-number">0xe</tt><tt class="py-op">,</tt> <tt class="py-number">0x3</tt><tt class="py-op">,</tt> <tt class="py-number">0x2</tt><tt class="py-op">,</tt>  </tt>
<a name="L204"></a><tt class="py-lineno">204</tt>  <tt class="py-line">                       <tt class="py-number">0x1a</tt><tt class="py-op">,</tt> <tt class="py-number">0x5</tt><tt class="py-op">,</tt> <tt class="py-number">0x0</tt><tt class="py-op">,</tt> <tt class="py-number">0x4</tt><tt class="py-op">,</tt> <tt class="py-number">0x14</tt><tt class="py-op">]</tt> </tt>
<a name="L205"></a><tt class="py-lineno">205</tt>  <tt class="py-line">  <tt class="py-name">encoded</tt> <tt class="py-op">=</tt> <tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-op">[</tt><tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-name">c</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">c</tt> <tt class="py-keyword">in</tt> <tt class="py-name">magic_sha1_header</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt id="link-68" class="py-name" targets="Function keyczar.util.Hash()=keyczar.util-module.html#Hash"><a title="keyczar.util.Hash" class="py-name" href="#" onclick="return doclink('link-68', 'Hash', 'link-68');">Hash</a></tt><tt class="py-op">(</tt><tt class="py-name">msg</tt><tt class="py-op">)</tt> </tt>
<a name="L206"></a><tt class="py-lineno">206</tt>  <tt class="py-line">  <tt class="py-name">pad_string</tt> <tt class="py-op">=</tt> <tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-number">0xFF</tt><tt class="py-op">)</tt> <tt class="py-op">*</tt> <tt class="py-op">(</tt><tt class="py-name">modulus_size</tt> <tt class="py-op">/</tt> <tt class="py-number">8</tt> <tt class="py-op">-</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">encoded</tt><tt class="py-op">)</tt> <tt class="py-op">-</tt> <tt class="py-number">3</tt><tt class="py-op">)</tt> </tt>
<a name="L207"></a><tt class="py-lineno">207</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-number">1</tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt class="py-name">pad_string</tt> <tt class="py-op">+</tt> <tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt class="py-name">encoded</tt> </tt>
</div><a name="L208"></a><tt class="py-lineno">208</tt>  <tt class="py-line"> </tt>
<a name="BinToBytes"></a><div id="BinToBytes-def"><a name="L209"></a><tt class="py-lineno">209</tt> <a class="py-toggle" href="#" id="BinToBytes-toggle" onclick="return toggle('BinToBytes');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#BinToBytes">BinToBytes</a><tt class="py-op">(</tt><tt class="py-param">bits</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="BinToBytes-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="BinToBytes-expanded"><a name="L210"></a><tt class="py-lineno">210</tt>  <tt class="py-line">  <tt class="py-docstring">"""Convert bit string to byte string."""</tt> </tt>
<a name="L211"></a><tt class="py-lineno">211</tt>  <tt class="py-line">  <tt class="py-name">bits</tt> <tt class="py-op">=</tt> <tt id="link-69" class="py-name" targets="Function keyczar.util._PadByte()=keyczar.util-module.html#_PadByte"><a title="keyczar.util._PadByte" class="py-name" href="#" onclick="return doclink('link-69', '_PadByte', 'link-69');">_PadByte</a></tt><tt class="py-op">(</tt><tt class="py-name">bits</tt><tt class="py-op">)</tt> </tt>
<a name="L212"></a><tt class="py-lineno">212</tt>  <tt class="py-line">  <tt class="py-name">octets</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">bits</tt><tt class="py-op">[</tt><tt class="py-number">8</tt><tt class="py-op">*</tt><tt class="py-name">i</tt><tt class="py-op">:</tt><tt class="py-number">8</tt><tt class="py-op">*</tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">+</tt><tt class="py-number">1</tt><tt class="py-op">)</tt><tt class="py-op">]</tt> <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">bits</tt><tt class="py-op">)</tt><tt class="py-op">/</tt><tt class="py-number">8</tt><tt class="py-op">)</tt><tt class="py-op">]</tt> </tt>
<a name="L213"></a><tt class="py-lineno">213</tt>  <tt class="py-line">  <tt class="py-name">bytes</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-name">int</tt><tt class="py-op">(</tt><tt class="py-name">x</tt><tt class="py-op">,</tt> <tt class="py-number">2</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">x</tt> <tt class="py-keyword">in</tt> <tt class="py-name">octets</tt><tt class="py-op">]</tt> </tt>
<a name="L214"></a><tt class="py-lineno">214</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-name">bytes</tt><tt class="py-op">)</tt> </tt>
</div><a name="L215"></a><tt class="py-lineno">215</tt>  <tt class="py-line"> </tt>
<a name="BytesToBin"></a><div id="BytesToBin-def"><a name="L216"></a><tt class="py-lineno">216</tt> <a class="py-toggle" href="#" id="BytesToBin-toggle" onclick="return toggle('BytesToBin');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#BytesToBin">BytesToBin</a><tt class="py-op">(</tt><tt class="py-param">bytes</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="BytesToBin-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="BytesToBin-expanded"><a name="L217"></a><tt class="py-lineno">217</tt>  <tt class="py-line">  <tt class="py-docstring">"""Convert byte string to bit string."""</tt> </tt>
<a name="L218"></a><tt class="py-lineno">218</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-op">[</tt><tt id="link-70" class="py-name"><a title="keyczar.util._PadByte" class="py-name" href="#" onclick="return doclink('link-70', '_PadByte', 'link-69');">_PadByte</a></tt><tt class="py-op">(</tt><tt id="link-71" class="py-name" targets="Function keyczar.util.IntToBin()=keyczar.util-module.html#IntToBin"><a title="keyczar.util.IntToBin" class="py-name" href="#" onclick="return doclink('link-71', 'IntToBin', 'link-71');">IntToBin</a></tt><tt class="py-op">(</tt><tt class="py-name">ord</tt><tt class="py-op">(</tt><tt class="py-name">byte</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">byte</tt> <tt class="py-keyword">in</tt> <tt class="py-name">bytes</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
</div><a name="L219"></a><tt class="py-lineno">219</tt>  <tt class="py-line"> </tt>
<a name="_PadByte"></a><div id="_PadByte-def"><a name="L220"></a><tt class="py-lineno">220</tt> <a class="py-toggle" href="#" id="_PadByte-toggle" onclick="return toggle('_PadByte');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#_PadByte">_PadByte</a><tt class="py-op">(</tt><tt class="py-param">bits</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="_PadByte-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="_PadByte-expanded"><a name="L221"></a><tt class="py-lineno">221</tt>  <tt class="py-line">  <tt class="py-docstring">"""Pad a string of bits with zeros to make its length a multiple of 8."""</tt> </tt>
<a name="L222"></a><tt class="py-lineno">222</tt>  <tt class="py-line">  <tt class="py-name">r</tt> <tt class="py-op">=</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">bits</tt><tt class="py-op">)</tt> <tt class="py-op">%</tt> <tt class="py-number">8</tt> </tt>
<a name="L223"></a><tt class="py-lineno">223</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-op">(</tt><tt class="py-op">(</tt><tt class="py-number">8</tt><tt class="py-op">-</tt><tt class="py-name">r</tt><tt class="py-op">)</tt> <tt class="py-op">%</tt> <tt class="py-number">8</tt><tt class="py-op">)</tt><tt class="py-op">*</tt><tt class="py-string">'0'</tt> <tt class="py-op">+</tt> <tt class="py-name">bits</tt> </tt>
</div><a name="L224"></a><tt class="py-lineno">224</tt>  <tt class="py-line"> </tt>
<a name="IntToBin"></a><div id="IntToBin-def"><a name="L225"></a><tt class="py-lineno">225</tt> <a class="py-toggle" href="#" id="IntToBin-toggle" onclick="return toggle('IntToBin');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#IntToBin">IntToBin</a><tt class="py-op">(</tt><tt class="py-param">n</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="IntToBin-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="IntToBin-expanded"><a name="L226"></a><tt class="py-lineno">226</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">n</tt> <tt class="py-op">==</tt> <tt class="py-number">0</tt> <tt class="py-keyword">or</tt> <tt class="py-name">n</tt> <tt class="py-op">==</tt> <tt class="py-number">1</tt><tt class="py-op">:</tt> </tt>
<a name="L227"></a><tt class="py-lineno">227</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-name">str</tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">)</tt> </tt>
<a name="L228"></a><tt class="py-lineno">228</tt>  <tt class="py-line">  <tt class="py-keyword">elif</tt> <tt class="py-name">n</tt> <tt class="py-op">%</tt> <tt class="py-number">2</tt> <tt class="py-op">==</tt> <tt class="py-number">0</tt><tt class="py-op">:</tt> </tt>
<a name="L229"></a><tt class="py-lineno">229</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt id="link-72" class="py-name"><a title="keyczar.util.IntToBin" class="py-name" href="#" onclick="return doclink('link-72', 'IntToBin', 'link-71');">IntToBin</a></tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">/</tt><tt class="py-number">2</tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt class="py-string">"0"</tt> </tt>
<a name="L230"></a><tt class="py-lineno">230</tt>  <tt class="py-line">  <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L231"></a><tt class="py-lineno">231</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt id="link-73" class="py-name"><a title="keyczar.util.IntToBin" class="py-name" href="#" onclick="return doclink('link-73', 'IntToBin', 'link-71');">IntToBin</a></tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">/</tt><tt class="py-number">2</tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt class="py-string">"1"</tt> </tt>
</div><a name="L232"></a><tt class="py-lineno">232</tt>  <tt class="py-line"> </tt>
<a name="BigIntToBytes"></a><div id="BigIntToBytes-def"><a name="L233"></a><tt class="py-lineno">233</tt> <a class="py-toggle" href="#" id="BigIntToBytes-toggle" onclick="return toggle('BigIntToBytes');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#BigIntToBytes">BigIntToBytes</a><tt class="py-op">(</tt><tt class="py-param">n</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="BigIntToBytes-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="BigIntToBytes-expanded"><a name="L234"></a><tt class="py-lineno">234</tt>  <tt class="py-line">  <tt class="py-docstring">"""Return a big-endian byte string representation of an arbitrary length n."""</tt> </tt>
<a name="L235"></a><tt class="py-lineno">235</tt>  <tt class="py-line">  <tt class="py-name">chars</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
<a name="L236"></a><tt class="py-lineno">236</tt>  <tt class="py-line">  <tt class="py-keyword">while</tt> <tt class="py-op">(</tt><tt class="py-name">n</tt> <tt class="py-op">&gt;</tt> <tt class="py-number">0</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
<a name="L237"></a><tt class="py-lineno">237</tt>  <tt class="py-line">    <tt class="py-name">chars</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-name">n</tt> <tt class="py-op">%</tt> <tt class="py-number">256</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L238"></a><tt class="py-lineno">238</tt>  <tt class="py-line">    <tt class="py-name">n</tt> <tt class="py-op">=</tt> <tt class="py-name">n</tt> <tt class="py-op">&gt;&gt;</tt> <tt class="py-number">8</tt> </tt>
<a name="L239"></a><tt class="py-lineno">239</tt>  <tt class="py-line">  <tt class="py-name">chars</tt><tt class="py-op">.</tt><tt class="py-name">reverse</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L240"></a><tt class="py-lineno">240</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-name">chars</tt><tt class="py-op">)</tt> </tt>
</div><a name="L241"></a><tt class="py-lineno">241</tt>  <tt class="py-line"> </tt>
<a name="IntToBytes"></a><div id="IntToBytes-def"><a name="L242"></a><tt class="py-lineno">242</tt> <a class="py-toggle" href="#" id="IntToBytes-toggle" onclick="return toggle('IntToBytes');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#IntToBytes">IntToBytes</a><tt class="py-op">(</tt><tt class="py-param">n</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="IntToBytes-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="IntToBytes-expanded"><a name="L243"></a><tt class="py-lineno">243</tt>  <tt class="py-line">  <tt class="py-docstring">"""Return byte string of 4 big-endian ordered bytes representing n."""</tt> </tt>
<a name="L244"></a><tt class="py-lineno">244</tt>  <tt class="py-line">  <tt class="py-name">bytes</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">m</tt> <tt class="py-op">%</tt> <tt class="py-number">256</tt> <tt class="py-keyword">for</tt> <tt class="py-name">m</tt> <tt class="py-keyword">in</tt> <tt class="py-op">[</tt><tt class="py-name">n</tt> <tt class="py-op">&gt;&gt;</tt> <tt class="py-number">24</tt><tt class="py-op">,</tt> <tt class="py-name">n</tt> <tt class="py-op">&gt;&gt;</tt> <tt class="py-number">16</tt><tt class="py-op">,</tt> <tt class="py-name">n</tt> <tt class="py-op">&gt;&gt;</tt> <tt class="py-number">8</tt><tt class="py-op">,</tt> <tt class="py-name">n</tt><tt class="py-op">]</tt><tt class="py-op">]</tt> </tt>
<a name="L245"></a><tt class="py-lineno">245</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-op">[</tt><tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-name">b</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">b</tt> <tt class="py-keyword">in</tt> <tt class="py-name">bytes</tt><tt class="py-op">]</tt><tt class="py-op">)</tt>  <tt class="py-comment"># byte array to byte string</tt> </tt>
</div><a name="L246"></a><tt class="py-lineno">246</tt>  <tt class="py-line"> </tt>
<a name="BytesToInt"></a><div id="BytesToInt-def"><a name="L247"></a><tt class="py-lineno">247</tt> <a class="py-toggle" href="#" id="BytesToInt-toggle" onclick="return toggle('BytesToInt');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#BytesToInt">BytesToInt</a><tt class="py-op">(</tt><tt class="py-param">bytes</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="BytesToInt-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="BytesToInt-expanded"><a name="L248"></a><tt class="py-lineno">248</tt>  <tt class="py-line">  <tt class="py-name">l</tt> <tt class="py-op">=</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">bytes</tt><tt class="py-op">)</tt> </tt>
<a name="L249"></a><tt class="py-lineno">249</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">sum</tt><tt class="py-op">(</tt><tt class="py-op">[</tt><tt class="py-name">ord</tt><tt class="py-op">(</tt><tt class="py-name">bytes</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> <tt class="py-op">*</tt> <tt class="py-number">256</tt><tt class="py-op">**</tt><tt class="py-op">(</tt><tt class="py-name">l</tt> <tt class="py-op">-</tt> <tt class="py-number">1</tt> <tt class="py-op">-</tt> <tt class="py-name">i</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">l</tt><tt class="py-op">)</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> </tt>
</div><a name="L250"></a><tt class="py-lineno">250</tt>  <tt class="py-line"> </tt>
<a name="Xor"></a><div id="Xor-def"><a name="L251"></a><tt class="py-lineno">251</tt> <a class="py-toggle" href="#" id="Xor-toggle" onclick="return toggle('Xor');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#Xor">Xor</a><tt class="py-op">(</tt><tt class="py-param">a</tt><tt class="py-op">,</tt> <tt class="py-param">b</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="Xor-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="Xor-expanded"><a name="L252"></a><tt class="py-lineno">252</tt>  <tt class="py-line">  <tt class="py-docstring">"""Return a ^ b as a byte string where a and b are byte strings."""</tt> </tt>
<a name="L253"></a><tt class="py-lineno">253</tt>  <tt class="py-line">  <tt class="py-comment"># pad shorter byte string with zeros to make length equal</tt> </tt>
<a name="L254"></a><tt class="py-lineno">254</tt>  <tt class="py-line"><tt class="py-comment"></tt>  <tt class="py-name">m</tt> <tt class="py-op">=</tt> <tt class="py-name">max</tt><tt class="py-op">(</tt><tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">a</tt><tt class="py-op">)</tt><tt class="py-op">,</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">b</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L255"></a><tt class="py-lineno">255</tt>  <tt class="py-line">  <tt class="py-name">a</tt> <tt class="py-op">=</tt> <tt id="link-74" class="py-name" targets="Function keyczar.util._PadBytes()=keyczar.util-module.html#_PadBytes"><a title="keyczar.util._PadBytes" class="py-name" href="#" onclick="return doclink('link-74', '_PadBytes', 'link-74');">_PadBytes</a></tt><tt class="py-op">(</tt><tt class="py-name">a</tt><tt class="py-op">,</tt> <tt class="py-name">m</tt> <tt class="py-op">-</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">a</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L256"></a><tt class="py-lineno">256</tt>  <tt class="py-line">  <tt class="py-name">b</tt> <tt class="py-op">=</tt> <tt id="link-75" class="py-name"><a title="keyczar.util._PadBytes" class="py-name" href="#" onclick="return doclink('link-75', '_PadBytes', 'link-74');">_PadBytes</a></tt><tt class="py-op">(</tt><tt class="py-name">b</tt><tt class="py-op">,</tt> <tt class="py-name">m</tt> <tt class="py-op">-</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">b</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L257"></a><tt class="py-lineno">257</tt>  <tt class="py-line">  <tt class="py-name">x</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">ord</tt><tt class="py-op">(</tt><tt class="py-name">c</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">c</tt> <tt class="py-keyword">in</tt> <tt class="py-name">a</tt><tt class="py-op">]</tt> </tt>
<a name="L258"></a><tt class="py-lineno">258</tt>  <tt class="py-line">  <tt class="py-name">y</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">ord</tt><tt class="py-op">(</tt><tt class="py-name">c</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">c</tt> <tt class="py-keyword">in</tt> <tt class="py-name">b</tt><tt class="py-op">]</tt> </tt>
<a name="L259"></a><tt class="py-lineno">259</tt>  <tt class="py-line">  <tt class="py-name">z</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-name">x</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt> <tt class="py-op">^</tt> <tt class="py-name">y</tt><tt class="py-op">[</tt><tt class="py-name">i</tt><tt class="py-op">]</tt><tt class="py-op">)</tt> <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">m</tt><tt class="py-op">)</tt><tt class="py-op">]</tt> </tt>
<a name="L260"></a><tt class="py-lineno">260</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt id="link-76" class="py-name" targets="Function keyczar.util._TrimBytes()=keyczar.util-module.html#_TrimBytes"><a title="keyczar.util._TrimBytes" class="py-name" href="#" onclick="return doclink('link-76', '_TrimBytes', 'link-76');">_TrimBytes</a></tt><tt class="py-op">(</tt><tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-name">z</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
</div><a name="L261"></a><tt class="py-lineno">261</tt>  <tt class="py-line">   </tt>
<a name="_PadBytes"></a><div id="_PadBytes-def"><a name="L262"></a><tt class="py-lineno">262</tt> <a class="py-toggle" href="#" id="_PadBytes-toggle" onclick="return toggle('_PadBytes');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#_PadBytes">_PadBytes</a><tt class="py-op">(</tt><tt class="py-param">bytes</tt><tt class="py-op">,</tt> <tt class="py-param">n</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="_PadBytes-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="_PadBytes-expanded"><a name="L263"></a><tt class="py-lineno">263</tt>  <tt class="py-line">  <tt class="py-docstring">"""Prepend a byte string with n zero bytes."""</tt> </tt>
<a name="L264"></a><tt class="py-lineno">264</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">n</tt> <tt class="py-op">*</tt> <tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt> <tt class="py-op">+</tt> <tt class="py-name">bytes</tt> </tt>
</div><a name="L265"></a><tt class="py-lineno">265</tt>  <tt class="py-line"> </tt>
<a name="_TrimBytes"></a><div id="_TrimBytes-def"><a name="L266"></a><tt class="py-lineno">266</tt> <a class="py-toggle" href="#" id="_TrimBytes-toggle" onclick="return toggle('_TrimBytes');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#_TrimBytes">_TrimBytes</a><tt class="py-op">(</tt><tt class="py-param">bytes</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="_TrimBytes-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="_TrimBytes-expanded"><a name="L267"></a><tt class="py-lineno">267</tt>  <tt class="py-line">  <tt class="py-docstring">"""Trim leading zero bytes."""</tt> </tt>
<a name="L268"></a><tt class="py-lineno">268</tt>  <tt class="py-line">  <tt class="py-name">trimmed</tt> <tt class="py-op">=</tt> <tt class="py-name">bytes</tt><tt class="py-op">.</tt><tt class="py-name">lstrip</tt><tt class="py-op">(</tt><tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L269"></a><tt class="py-lineno">269</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">trimmed</tt> <tt class="py-op">==</tt> <tt class="py-string">""</tt><tt class="py-op">:</tt>  <tt class="py-comment"># was a string of all zero bytes</tt> </tt>
<a name="L270"></a><tt class="py-lineno">270</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-name">chr</tt><tt class="py-op">(</tt><tt class="py-number">0</tt><tt class="py-op">)</tt> </tt>
<a name="L271"></a><tt class="py-lineno">271</tt>  <tt class="py-line">  <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L272"></a><tt class="py-lineno">272</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-name">trimmed</tt> </tt>
</div><a name="L273"></a><tt class="py-lineno">273</tt>  <tt class="py-line"> </tt>
<a name="RandBytes"></a><div id="RandBytes-def"><a name="L274"></a><tt class="py-lineno">274</tt> <a class="py-toggle" href="#" id="RandBytes-toggle" onclick="return toggle('RandBytes');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#RandBytes">RandBytes</a><tt class="py-op">(</tt><tt class="py-param">n</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="RandBytes-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="RandBytes-expanded"><a name="L275"></a><tt class="py-lineno">275</tt>  <tt class="py-line">  <tt class="py-docstring">"""Return n random bytes."""</tt> </tt>
<a name="L276"></a><tt class="py-lineno">276</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">randpool</tt><tt class="py-op">.</tt><tt class="py-name">RandomPool</tt><tt class="py-op">(</tt><tt class="py-number">512</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt class="py-name">get_bytes</tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">)</tt> </tt>
</div><a name="L277"></a><tt class="py-lineno">277</tt>  <tt class="py-line"> </tt>
<a name="Hash"></a><div id="Hash-def"><a name="L278"></a><tt class="py-lineno">278</tt> <a class="py-toggle" href="#" id="Hash-toggle" onclick="return toggle('Hash');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#Hash">Hash</a><tt class="py-op">(</tt><tt class="py-op">*</tt><tt class="py-param">inputs</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="Hash-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="Hash-expanded"><a name="L279"></a><tt class="py-lineno">279</tt>  <tt class="py-line">  <tt class="py-docstring">"""Return a SHA-1 hash over a variable number of inputs."""</tt> </tt>
<a name="L280"></a><tt class="py-lineno">280</tt>  <tt class="py-line">  <tt class="py-name">md</tt> <tt class="py-op">=</tt> <tt class="py-name">sha</tt><tt class="py-op">.</tt><tt class="py-name">new</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L281"></a><tt class="py-lineno">281</tt>  <tt class="py-line">  <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">inputs</tt><tt class="py-op">:</tt> </tt>
<a name="L282"></a><tt class="py-lineno">282</tt>  <tt class="py-line">    <tt class="py-name">md</tt><tt class="py-op">.</tt><tt class="py-name">update</tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">)</tt> </tt>
<a name="L283"></a><tt class="py-lineno">283</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">md</tt><tt class="py-op">.</tt><tt class="py-name">digest</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
</div><a name="L284"></a><tt class="py-lineno">284</tt>  <tt class="py-line"> </tt>
<a name="Encode"></a><div id="Encode-def"><a name="L285"></a><tt class="py-lineno">285</tt> <a class="py-toggle" href="#" id="Encode-toggle" onclick="return toggle('Encode');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#Encode">Encode</a><tt class="py-op">(</tt><tt class="py-param">s</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="Encode-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="Encode-expanded"><a name="L286"></a><tt class="py-lineno">286</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L287"></a><tt class="py-lineno">287</tt>  <tt class="py-line"><tt class="py-docstring">  Return Base64 encoding of s. Suppress padding characters (=).</tt> </tt>
<a name="L288"></a><tt class="py-lineno">288</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L289"></a><tt class="py-lineno">289</tt>  <tt class="py-line"><tt class="py-docstring">  Uses URL-safe alphabet: - replaces +, _ replaces /. Will convert s of type</tt> </tt>
<a name="L290"></a><tt class="py-lineno">290</tt>  <tt class="py-line"><tt class="py-docstring">  unicode to string type first.</tt> </tt>
<a name="L291"></a><tt class="py-lineno">291</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L292"></a><tt class="py-lineno">292</tt>  <tt class="py-line"><tt class="py-docstring">  @param s: string to encode as Base64</tt> </tt>
<a name="L293"></a><tt class="py-lineno">293</tt>  <tt class="py-line"><tt class="py-docstring">  @type s: string</tt> </tt>
<a name="L294"></a><tt class="py-lineno">294</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L295"></a><tt class="py-lineno">295</tt>  <tt class="py-line"><tt class="py-docstring">  @return: Base64 representation of s.</tt> </tt>
<a name="L296"></a><tt class="py-lineno">296</tt>  <tt class="py-line"><tt class="py-docstring">  @rtype: string</tt> </tt>
<a name="L297"></a><tt class="py-lineno">297</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L298"></a><tt class="py-lineno">298</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">base64</tt><tt class="py-op">.</tt><tt class="py-name">urlsafe_b64encode</tt><tt class="py-op">(</tt><tt class="py-name">str</tt><tt class="py-op">(</tt><tt class="py-name">s</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt class="py-name">replace</tt><tt class="py-op">(</tt><tt class="py-string">"="</tt><tt class="py-op">,</tt> <tt class="py-string">""</tt><tt class="py-op">)</tt> </tt>
</div><a name="L299"></a><tt class="py-lineno">299</tt>  <tt class="py-line">   </tt>
<a name="L300"></a><tt class="py-lineno">300</tt>  <tt class="py-line"> </tt>
<a name="Decode"></a><div id="Decode-def"><a name="L301"></a><tt class="py-lineno">301</tt> <a class="py-toggle" href="#" id="Decode-toggle" onclick="return toggle('Decode');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#Decode">Decode</a><tt class="py-op">(</tt><tt class="py-param">s</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="Decode-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="Decode-expanded"><a name="L302"></a><tt class="py-lineno">302</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L303"></a><tt class="py-lineno">303</tt>  <tt class="py-line"><tt class="py-docstring">  Return decoded version of given Base64 string. Ignore whitespace.</tt> </tt>
<a name="L304"></a><tt class="py-lineno">304</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L305"></a><tt class="py-lineno">305</tt>  <tt class="py-line"><tt class="py-docstring">  Uses URL-safe alphabet: - replaces +, _ replaces /. Will convert s of type</tt> </tt>
<a name="L306"></a><tt class="py-lineno">306</tt>  <tt class="py-line"><tt class="py-docstring">  unicode to string type first.</tt> </tt>
<a name="L307"></a><tt class="py-lineno">307</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L308"></a><tt class="py-lineno">308</tt>  <tt class="py-line"><tt class="py-docstring">  @param s: Base64 string to decode</tt> </tt>
<a name="L309"></a><tt class="py-lineno">309</tt>  <tt class="py-line"><tt class="py-docstring">  @type s: string</tt> </tt>
<a name="L310"></a><tt class="py-lineno">310</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L311"></a><tt class="py-lineno">311</tt>  <tt class="py-line"><tt class="py-docstring">  @return: original string that was encoded as Base64</tt> </tt>
<a name="L312"></a><tt class="py-lineno">312</tt>  <tt class="py-line"><tt class="py-docstring">  @rtype: string</tt> </tt>
<a name="L313"></a><tt class="py-lineno">313</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L314"></a><tt class="py-lineno">314</tt>  <tt class="py-line"><tt class="py-docstring">  @raise Base64DecodingError: If length of string (ignoring whitespace) is one </tt> </tt>
<a name="L315"></a><tt class="py-lineno">315</tt>  <tt class="py-line"><tt class="py-docstring">    more than a multiple of four.</tt> </tt>
<a name="L316"></a><tt class="py-lineno">316</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L317"></a><tt class="py-lineno">317</tt>  <tt class="py-line">  <tt class="py-name">s</tt> <tt class="py-op">=</tt> <tt class="py-name">str</tt><tt class="py-op">(</tt><tt class="py-name">s</tt><tt class="py-op">.</tt><tt class="py-name">replace</tt><tt class="py-op">(</tt><tt class="py-string">" "</tt><tt class="py-op">,</tt> <tt class="py-string">""</tt><tt class="py-op">)</tt><tt class="py-op">)</tt>  <tt class="py-comment"># kill whitespace, make string (not unicode)</tt> </tt>
<a name="L318"></a><tt class="py-lineno">318</tt>  <tt class="py-line">  <tt class="py-name">d</tt> <tt class="py-op">=</tt> <tt class="py-name">len</tt><tt class="py-op">(</tt><tt class="py-name">s</tt><tt class="py-op">)</tt> <tt class="py-op">%</tt> <tt class="py-number">4</tt> </tt>
<a name="L319"></a><tt class="py-lineno">319</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">d</tt> <tt class="py-op">==</tt> <tt class="py-number">1</tt><tt class="py-op">:</tt> </tt>
<a name="L320"></a><tt class="py-lineno">320</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-77" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-77', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-78" class="py-name" targets="Class keyczar.errors.Base64DecodingError=keyczar.errors.Base64DecodingError-class.html"><a title="keyczar.errors.Base64DecodingError" class="py-name" href="#" onclick="return doclink('link-78', 'Base64DecodingError', 'link-78');">Base64DecodingError</a></tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L321"></a><tt class="py-lineno">321</tt>  <tt class="py-line">  <tt class="py-keyword">elif</tt> <tt class="py-name">d</tt> <tt class="py-op">==</tt> <tt class="py-number">2</tt><tt class="py-op">:</tt> </tt>
<a name="L322"></a><tt class="py-lineno">322</tt>  <tt class="py-line">    <tt class="py-name">s</tt> <tt class="py-op">+=</tt> <tt class="py-string">"=="</tt> </tt>
<a name="L323"></a><tt class="py-lineno">323</tt>  <tt class="py-line">  <tt class="py-keyword">elif</tt> <tt class="py-name">d</tt> <tt class="py-op">==</tt> <tt class="py-number">3</tt><tt class="py-op">:</tt> </tt>
<a name="L324"></a><tt class="py-lineno">324</tt>  <tt class="py-line">    <tt class="py-name">s</tt> <tt class="py-op">+=</tt> <tt class="py-string">"="</tt> </tt>
<a name="L325"></a><tt class="py-lineno">325</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-name">base64</tt><tt class="py-op">.</tt><tt class="py-name">urlsafe_b64decode</tt><tt class="py-op">(</tt><tt class="py-name">s</tt><tt class="py-op">)</tt> </tt>
</div><a name="L326"></a><tt class="py-lineno">326</tt>  <tt class="py-line"> </tt>
<a name="WriteFile"></a><div id="WriteFile-def"><a name="L327"></a><tt class="py-lineno">327</tt> <a class="py-toggle" href="#" id="WriteFile-toggle" onclick="return toggle('WriteFile');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#WriteFile">WriteFile</a><tt class="py-op">(</tt><tt class="py-param">data</tt><tt class="py-op">,</tt> <tt class="py-param">loc</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="WriteFile-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="WriteFile-expanded"><a name="L328"></a><tt class="py-lineno">328</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L329"></a><tt class="py-lineno">329</tt>  <tt class="py-line"><tt class="py-docstring">  Writes data to file at given location.</tt> </tt>
<a name="L330"></a><tt class="py-lineno">330</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L331"></a><tt class="py-lineno">331</tt>  <tt class="py-line"><tt class="py-docstring">  @param data: contents to be written to file</tt> </tt>
<a name="L332"></a><tt class="py-lineno">332</tt>  <tt class="py-line"><tt class="py-docstring">  @type data: string</tt> </tt>
<a name="L333"></a><tt class="py-lineno">333</tt>  <tt class="py-line"><tt class="py-docstring">   </tt> </tt>
<a name="L334"></a><tt class="py-lineno">334</tt>  <tt class="py-line"><tt class="py-docstring">  @param loc: name of file to write to</tt> </tt>
<a name="L335"></a><tt class="py-lineno">335</tt>  <tt class="py-line"><tt class="py-docstring">  @type loc: string </tt> </tt>
<a name="L336"></a><tt class="py-lineno">336</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L337"></a><tt class="py-lineno">337</tt>  <tt class="py-line"><tt class="py-docstring">  @raise KeyczarError: if unable to write to file because of IOError </tt> </tt>
<a name="L338"></a><tt class="py-lineno">338</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L339"></a><tt class="py-lineno">339</tt>  <tt class="py-line">  <tt class="py-keyword">try</tt><tt class="py-op">:</tt> </tt>
<a name="L340"></a><tt class="py-lineno">340</tt>  <tt class="py-line">    <tt class="py-name">f</tt> <tt class="py-op">=</tt> <tt class="py-name">open</tt><tt class="py-op">(</tt><tt class="py-name">loc</tt><tt class="py-op">,</tt> <tt class="py-string">"w"</tt><tt class="py-op">)</tt> </tt>
<a name="L341"></a><tt class="py-lineno">341</tt>  <tt class="py-line">    <tt class="py-name">f</tt><tt class="py-op">.</tt><tt class="py-name">write</tt><tt class="py-op">(</tt><tt class="py-name">data</tt><tt class="py-op">)</tt> </tt>
<a name="L342"></a><tt class="py-lineno">342</tt>  <tt class="py-line">    <tt class="py-name">f</tt><tt class="py-op">.</tt><tt class="py-name">close</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L343"></a><tt class="py-lineno">343</tt>  <tt class="py-line">  <tt class="py-keyword">except</tt> <tt class="py-name">IOError</tt><tt class="py-op">:</tt> </tt>
<a name="L344"></a><tt class="py-lineno">344</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-79" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-79', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-80" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-80', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Unable to write to file %s."</tt> <tt class="py-op">%</tt> <tt class="py-name">loc</tt><tt class="py-op">)</tt> </tt>
</div><a name="L345"></a><tt class="py-lineno">345</tt>  <tt class="py-line"> </tt>
<a name="ReadFile"></a><div id="ReadFile-def"><a name="L346"></a><tt class="py-lineno">346</tt> <a class="py-toggle" href="#" id="ReadFile-toggle" onclick="return toggle('ReadFile');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#ReadFile">ReadFile</a><tt class="py-op">(</tt><tt class="py-param">loc</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="ReadFile-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="ReadFile-expanded"><a name="L347"></a><tt class="py-lineno">347</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L348"></a><tt class="py-lineno">348</tt>  <tt class="py-line"><tt class="py-docstring">  Read data from file at given location.</tt> </tt>
<a name="L349"></a><tt class="py-lineno">349</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L350"></a><tt class="py-lineno">350</tt>  <tt class="py-line"><tt class="py-docstring">  @param loc: name of file to read from</tt> </tt>
<a name="L351"></a><tt class="py-lineno">351</tt>  <tt class="py-line"><tt class="py-docstring">  @type loc: string</tt> </tt>
<a name="L352"></a><tt class="py-lineno">352</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L353"></a><tt class="py-lineno">353</tt>  <tt class="py-line"><tt class="py-docstring">  @return: contents of the file</tt> </tt>
<a name="L354"></a><tt class="py-lineno">354</tt>  <tt class="py-line"><tt class="py-docstring">  @rtype: string</tt> </tt>
<a name="L355"></a><tt class="py-lineno">355</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L356"></a><tt class="py-lineno">356</tt>  <tt class="py-line"><tt class="py-docstring">  @raise KeyczarError: if unable to read from file because of IOError </tt> </tt>
<a name="L357"></a><tt class="py-lineno">357</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L358"></a><tt class="py-lineno">358</tt>  <tt class="py-line">  <tt class="py-keyword">try</tt><tt class="py-op">:</tt> </tt>
<a name="L359"></a><tt class="py-lineno">359</tt>  <tt class="py-line">    <tt class="py-keyword">return</tt> <tt class="py-name">open</tt><tt class="py-op">(</tt><tt class="py-name">loc</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt class="py-name">read</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L360"></a><tt class="py-lineno">360</tt>  <tt class="py-line">  <tt class="py-keyword">except</tt> <tt class="py-name">IOError</tt><tt class="py-op">:</tt> </tt>
<a name="L361"></a><tt class="py-lineno">361</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-81" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-81', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-82" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-82', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"Unable to read file %s."</tt> <tt class="py-op">%</tt> <tt class="py-name">loc</tt><tt class="py-op">)</tt> </tt>
</div><a name="L362"></a><tt class="py-lineno">362</tt>  <tt class="py-line"> </tt>
<a name="MGF"></a><div id="MGF-def"><a name="L363"></a><tt class="py-lineno">363</tt> <a class="py-toggle" href="#" id="MGF-toggle" onclick="return toggle('MGF');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="keyczar.util-module.html#MGF">MGF</a><tt class="py-op">(</tt><tt class="py-param">seed</tt><tt class="py-op">,</tt> <tt class="py-param">mlen</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="MGF-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="MGF-expanded"><a name="L364"></a><tt class="py-lineno">364</tt>  <tt class="py-line">  <tt class="py-docstring">"""</tt> </tt>
<a name="L365"></a><tt class="py-lineno">365</tt>  <tt class="py-line"><tt class="py-docstring">  Mask Generation Function (MGF1) with SHA-1 as hash.</tt> </tt>
<a name="L366"></a><tt class="py-lineno">366</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L367"></a><tt class="py-lineno">367</tt>  <tt class="py-line"><tt class="py-docstring">  @param seed: used to generate mask, a byte string</tt> </tt>
<a name="L368"></a><tt class="py-lineno">368</tt>  <tt class="py-line"><tt class="py-docstring">  @type seed: string</tt> </tt>
<a name="L369"></a><tt class="py-lineno">369</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L370"></a><tt class="py-lineno">370</tt>  <tt class="py-line"><tt class="py-docstring">  @param mlen: desired length of mask</tt> </tt>
<a name="L371"></a><tt class="py-lineno">371</tt>  <tt class="py-line"><tt class="py-docstring">  @type mlen: integer</tt> </tt>
<a name="L372"></a><tt class="py-lineno">372</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L373"></a><tt class="py-lineno">373</tt>  <tt class="py-line"><tt class="py-docstring">  @return: mask, byte string of length mlen</tt> </tt>
<a name="L374"></a><tt class="py-lineno">374</tt>  <tt class="py-line"><tt class="py-docstring">  @rtype: string</tt> </tt>
<a name="L375"></a><tt class="py-lineno">375</tt>  <tt class="py-line"><tt class="py-docstring">  </tt> </tt>
<a name="L376"></a><tt class="py-lineno">376</tt>  <tt class="py-line"><tt class="py-docstring">  @raise KeyczarError: if mask length too long, &gt; 2^32 * hash_length  </tt> </tt>
<a name="L377"></a><tt class="py-lineno">377</tt>  <tt class="py-line"><tt class="py-docstring">  """</tt> </tt>
<a name="L378"></a><tt class="py-lineno">378</tt>  <tt class="py-line">  <tt class="py-keyword">if</tt> <tt class="py-name">mlen</tt> <tt class="py-op">&gt;</tt> <tt class="py-number">2</tt><tt class="py-op">**</tt><tt class="py-number">32</tt> <tt class="py-op">*</tt> <tt id="link-83" class="py-name"><a title="keyczar.util.HLEN" class="py-name" href="#" onclick="return doclink('link-83', 'HLEN', 'link-1');">HLEN</a></tt><tt class="py-op">:</tt> </tt>
<a name="L379"></a><tt class="py-lineno">379</tt>  <tt class="py-line">    <tt class="py-keyword">raise</tt> <tt id="link-84" class="py-name"><a title="keyczar.errors" class="py-name" href="#" onclick="return doclink('link-84', 'errors', 'link-0');">errors</a></tt><tt class="py-op">.</tt><tt id="link-85" class="py-name"><a title="keyczar.errors.KeyczarError" class="py-name" href="#" onclick="return doclink('link-85', 'KeyczarError', 'link-11');">KeyczarError</a></tt><tt class="py-op">(</tt><tt class="py-string">"MGF1 mask length too long."</tt><tt class="py-op">)</tt> </tt>
<a name="L380"></a><tt class="py-lineno">380</tt>  <tt class="py-line">  <tt class="py-keyword">return</tt> <tt class="py-op">(</tt><tt class="py-string">""</tt><tt class="py-op">.</tt><tt class="py-name">join</tt><tt class="py-op">(</tt><tt class="py-op">[</tt><tt id="link-86" class="py-name"><a title="keyczar.util.Hash" class="py-name" href="#" onclick="return doclink('link-86', 'Hash', 'link-68');">Hash</a></tt><tt class="py-op">(</tt><tt class="py-name">seed</tt><tt class="py-op">,</tt> <tt id="link-87" class="py-name" targets="Function keyczar.util.IntToBytes()=keyczar.util-module.html#IntToBytes"><a title="keyczar.util.IntToBytes" class="py-name" href="#" onclick="return doclink('link-87', 'IntToBytes', 'link-87');">IntToBytes</a></tt><tt class="py-op">(</tt><tt class="py-name">i</tt><tt class="py-op">)</tt><tt class="py-op">)</tt> </tt>
<a name="L381"></a><tt class="py-lineno">381</tt>  <tt class="py-line">                   <tt class="py-keyword">for</tt> <tt class="py-name">i</tt> <tt class="py-keyword">in</tt> <tt class="py-name">range</tt><tt class="py-op">(</tt><tt class="py-name">int</tt><tt class="py-op">(</tt><tt class="py-name">math</tt><tt class="py-op">.</tt><tt class="py-name">ceil</tt><tt class="py-op">(</tt><tt class="py-name">mlen</tt> <tt class="py-op">/</tt> <tt class="py-name">float</tt><tt class="py-op">(</tt><tt id="link-88" class="py-name"><a title="keyczar.util.HLEN" class="py-name" href="#" onclick="return doclink('link-88', 'HLEN', 'link-1');">HLEN</a></tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">]</tt><tt class="py-op">)</tt><tt class="py-op">)</tt><tt class="py-op">[</tt><tt class="py-op">:</tt><tt class="py-name">mlen</tt><tt class="py-op">]</tt> </tt>
</div><a name="L382"></a><tt class="py-lineno">382</tt>  <tt class="py-line"> </tt><script type="text/javascript">
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